Freelancing Opportunity Senior Linux Administrator Education: BE/B.Tech in Computer Science or Information Technology / MCA Experience: 5+ Years in IT Infrastructure Management Profile Summary: Highly experienced and results-driven Linux Administrator with over 8 years of progressive experience in managing, deploying, and maintaining complex Linux-based environments. Possess a strong background in system administration, network services, user access control, and open-source technologies. Proven expertise in handling RADIUS servers, LDAP authentication systems, and database administration in enterprise-level infrastructure. Adept at identifying and resolving issues, optimizing performance, and implementing robust security measures. Core Competencies: Operating Systems: Red Hat Enterprise Linux (RHEL), CentOS, Ubuntu, Debian, SUSE Authentication & Authorization: Installation and configuration of RADIUS servers (e.g., FreeRADIUS) for centralized network authentication Experience in setting up and managing LDAP (e.g., OpenLDAP, 389 Directory Server) for directory services and user management Database Management: Installation, configuration, tuning, and backup of databases such as MySQL, PostgreSQL, and MariaDB Integration of database backends with applications and monitoring for performance issues Networking & Security: Firewall configuration (iptables, firewalld), VPN setup, secure shell access, and network troubleshooting Implementation of security best practices (SELinux, auditd, logwatch, fail2ban) Scripting & Automation: Proficiency in Bash, Shell scripting, and basic Python for automating routine tasks and system monitoring Monitoring & Tools: Experience with tools like Nagios, Zabbix, Prometheus, Grafana for system and service monitoring Server & Application Support: Web servers (Apache, Nginx), DNS (BIND), DHCP, SMTP/IMAP (Postfix, Dovecot) System patching, kernel upgrades, and performance tuning Professional Experience Highlights: Led the migration of enterprise infrastructure from legacy systems to modern Linux distributions, reducing downtime by 30% Designed and deployed RADIUS-based network access control for over 500 users across distributed locations Implemented centralized LDAP user authentication integrated with multiple services including Samba, SSH, and internal portals Conducted regular database performance tuning and ensured high availability of critical applications Automated backup and restore procedures for databases and configuration files, improving disaster recovery readiness Certifications (if applicable): Red Hat Certified System Administrator (RHCSA) Red Hat Certified Engineer (RHCE) LPIC-1 / LPIC-2 (Linux Professional Institute Certification) CompTIA Linux+ Show more Show less
